Dynamics Definition and 1000 Threads

Homework Statement Find the normal force in terms of g, m, θ and α. There is no friction. a=0, θ≠α See first attachment for diagram Homework Equations Fx=max The Attempt at a Solution I drew a free body diagram including the forces; normal, mg, and |FA| (See second...

Homework Statement A box is halfway up a ramp. The ramp makes an angle, θ with the ground. What is the maximum value of θ before the mass will slip? μ_{s}=0.25 Homework Equations F_{x}=ma_{x} The Attempt at a Solution I drew a free body diagram to show the forces affecting the box...

Homework Statement A box is halfway up a ramp. The ramp makes an angle, θ with the ground. What is the maximum value of θ before the mass will slip? μ_{s}=0.25 Homework Equations F_{x}=ma_{x} The Attempt at a Solution I drew a free body diagram to show the forces affecting the box...

Suppose that the population of a species of fish in a certain lake is hypothesized to grow according to a logistic model of population growth with growth rate \(r=0.3\) and carrying capacity \(k=3000\). Assume initially there are 2500 fish of the species in the lake. Determine the correct...

Homework Statement I've been having some problems trying to do a few lab questions for my physics class, I'm not very good at it but I do try to make the best of it so anyone that's willing to help me give me any pointers would be awesome. I have two physics problem and I'm supposed to do them...

hey all im taking a graduate level fluid mechanics course. we are using a good amount of vector calculus (expected) and also tensor algebra, leading into the kronecker delta and Levi-Civita symbol (shockingly never saw these before, though implicitly used them). it seems linear algebra is...

Centripetal force problems for dynamics :) Homework Statement I have two questions! 1. You are driving at a speed of 60.0km/h around a turn with a radius of 75m. The coefficient of friction between the tires and the road is 0.85. a. After traveling 20° around the turn, you hit a...

I can't seem to model this properly. This isn't an assignment, I'm just curious how this will go, lol. So I have this tank with an incoming feed stream with temperature Ti, and an output stream T. It has a jacket where q would be modified depending on the desired output stream T. So I...

Homework Statement There is a box pulled up a ramp at an angle, θ via a pulley system with a mass m1 at the end, accelerating downward under the influence of gravity and tension in the rope connected to the box. The goal is to find the coefficient of kinetic friction between the leather bottom...

Homework Statement A 60kg student lowers herself down 40m at a constant speed of 1.0 m/s. The chair has a mass of 35kg. Find the force of the rope. (See image) Homework Equations I was using force equations in attempts to solve for the problem. The Attempt at a Solution...

Hi there, I just would like if someone could check over my work on my current homework assignment involving fluid dynamics. Homework Statement 1) Calculate the absolute pressure at an ocean depth of two kilometers. Assume the density of seawater is 1000 kg/m3, the density of air is 1.3...

Homework Statement "A 60kg student lifts herself from rest to a speed of 1.5m/s in 2.1s. The chair has a mass of 35kg." All information is included in the accompanying image. In short, it is a basic kinematic and dynamic equation. Currently, we are only working on problems that involve...

Hi, I've been toying with a thought experiment, and I was wondering if it had any basis in reality. Is it possible to confine like-charged particles (e.g., primarily positive or primarily negative) to a particular space? After doing some searching, I stumbled upon "non-neutral plasmas", which...

I just started Physics 1 this semester. Although the kinematics we covered so far were simple, our teacher didn't do a particularly good job at explaining dynamics. In fact, all 10 students I talked to were left clueless by his lecture. What we don't understand at this point is the concept...

Homework Statement "In a movie scene involving a car chase, a car goes over the top of ramp A and lands a B below. Determine the speed of the car at A if the car is to cover distance d=180ft for \alpha =15° and \beta = 30°. Neglect aerodynamic effects. Homework Equations Word.doc is the...

Homework Statement A rigid vertical wall separates two liquid reservoirs. The first reservoir contains oil of density p=864 kgm-3 at a height of 6m above the ground, while the second reservoir contains water (1000kgm-3) at a height of 5m from the reservoir bottom. Calculate the resultant...

Homework Statement A ball of 10kg mass is suspended by a cable that passes through a hole in a floor. The ball rotates in a circular orbit, A, that is in a plane that is 3m below the floor. If the orbit has a radius of 1m, calculate; a) Tension in the cable b) speed va of the ball in...

Torque, in particular, is always a concept that has confused me. Can the rules related to torque be derived or are they natural tendencies? (For lack of a better way to phrase this). For example, if I were trying to solve the problem of a ladder leaning against a frictionless wall, where I...

Homework Statement During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42° above the horizontal, giving it an initial velocity of 15 m/s. If the ball is 5.3 m above the level of the playing field when you...

Hello everybody, I am looking for some help from Native english speakers (or otherwise extremely good speakers), for a bulletproof grammar review for a research paper. The paper is about education and automotive engineering, so context is important and so the reason I post it here. If...

I'm a high school grad, my knowledge of college level physics is quite rudimentary. I would like to start learning about L & H dynamics. What textbook would you guys recommend for novices?

Hello, A sinusoidally driven and undisturbed cantilever of an atomic force microscope (AFM) oscillates ideally in a sinusoidal fashion but the motion of the cantilever (time-domain trajectory) can become more complicated when it is disturbed by the inter-atomic forces as the cantilever taps...

This is an image of Classical Dynamics of Particles & Systems, chapter 1 In deriving the equations for the rotation of a coordinate system I understand the equations 1.2a & 1.2b b, but why is the projection of x2 on the x'1 equal to ab +bc and why is the vector de equal to the vector Of? I...

I did BA Maths at Cambridge with a First Class back in 2009-12, worked in i-banking for one year (partially because I need to fund my graduate study) and will continue with a Master in Maths at Cam this coming autumn. My courses had been (and will continue to be) concentrated in Fluid Dynamics...

1. Homework Statement the question is: A 62 kg person in an elevator is moving up at a constant speed of 4.0 m/s for 5.0 s. T / I C (b) Calculate the work done by the normal force on the person. (c) Calculate the work done by the force of gravity on the person. (d) How would your...

Homework Statement Aircraft A is describing a circular flight path in an anti-clockwise direction at 125km/h Aircraft B is flying the same path but in the opposite direction at 225km/h. If the radius of the flight path is 5km, calculate the acceleration of A relative to B when Aircraft A is...

I did read some of the posts on the topic. However, I just want to check my qualitative understanding without employing too much mathematical dynamics. If anyone has some feedback, this would be much appreciated. The System. A spring hangs vertically. There is a mass attached to it...

Homework Statement An oxygen molecule consists of two oxygen atoms whose total mass is 5.3x10^-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.9 x 10^-46 kg*m^2. From this data, estimate the effective distance between...

Hoping someone finds this problem interesting, I'm looking for some ideas on how to solve a real world problem, not a complete and detailed solution. This topic is related to an astrophysical situation. However, I prefer to present it just as a question on gas dynamics since there's no need for...

Hi there I was wondering if someone can help me on this attachment I am stuck on question 1.3 and 1.4. This was an experiment to see relationship between sin and gradient I have confidently completed the first two questions but it is the last two questions which are troubling with I am finding...

Homework Statement there are three masses m2 is on a table top with coefficient of friction of 0.350 with two different masses on each side. They are connected by a mass-less string and friction-less pulley m1=4kg m2=1kg m3=2kg 1.]find the acceleration of all three masses...

I'm studying for my exam and I don't understand the solution to a problem. I hope someone could help. It's actually for Dynamics. problem: A skier coasts down a hill without initial velocity. The slope is at angle α = 30° with respect to the horizon from p. A to p. B. From p. B to p. C the...

First time posting. Homework Statement Gears A and B, of Masses 4kg and 10kg, respectively, are rotating about their mass centers. The radius of gyration about the axis of rotation is 100mm for A and 300mm for B. A constant couple of C=0.75Nm acts on gear A. Neglecting friction, compute: -...

I was reminded of this point by a recent discussion in the "Classification of manifolds ..." thread. The question is this: As I understand it, the NCG framework requires a Riemannian manifold. Given this, at best one could hope to obtain a Euclidean theory, right? So is it fair to say...

Homework Statement In the figure a block of mass 'm' is placed on a wedge of mass M. The wedge is subject to a horizontal force 'F' and slides on a friction less surface. The coefficient of static friction between the block and wedge is μs. Find the range of values of 'F' for which the block...

Homework Statement The 15.8-in. spring is compressed to a 7.1-in. length, where it is released from rest and accelerates the sliding block A. The acceleration has an initial value of 160 ft/sec2 and then decreases linearly with the x-movement of the block, reaching zero when the spring...

Homework Statement Problem: Calculate the constant acceleration a in g’s which the catapult of an aircraft carrier must provide to produce a launch velocity of 188 mi/hr in a distance of 299 ft. Assume that the carrier is at anchor. Homework Equations V^2 = 2AD The Attempt at a...

An interesting paper within the pilot-wave camp by Colin/Valentini arguing in favour of de Broglie dynamics over Bohmian mechanics: Instability of quantum equilibrium in Bohm's dynamics http://lanl.arxiv.org/pdf/1306.1576.pdf

Homework Statement a) Find a mechanical system that is approximately governed by \dot{x}=sin(x) b) Using your physical intuition, explain why it now becomes obvious that x*=0 is an unstable fixed point and x*=\pi is stable. Homework Equations \dot{x}=sin(x) (?) The Attempt at a Solution...

Homework Statement Air, supplied by a reservoir at 450 kPa, flows through a converging-diverging nozzle whose throat area is 12 cm^2. A normal shock stands where A1 = 20 cm^2. (a) Compute the pressure, p2, just downstream of this shock. Still farther downstream, where A3 = 30 cm^2, estimate (b)...

Homework Statement Initial velocity = 17 m/s Radius of curvature = 13 m Acceleration as a function of position = -0.25s m/s^2 Time elapsed = 2 s Solve for the magnitude of the acceleration. Homework Equations a = v (dv/ds) a^2 = a(t)^2 + a(n)^2, wherein a(t) is tangential...

Homework Statement Determine the acceleration of a 10kg block traveling up a ramp connected by a massless string and massless pulley to another block that is 5kg and in free-fall. if the coefficient of kinetic friction between the block and the ramp is 0.2 (The diagram shows one block...

Homework Statement 1) A 1000-kg Car is parked on a 10 degree slope. Determine the magnitude of the frictional force acting on the car 2) A 2000-kg car traveling at an initial speed of 10m/s skids to a stop with a constant acceleration. The coefficient of friction between the tired and the...

I'm going to be working on a research project for an internship that involves photo-generated carrier dynamics, and after looking up the topic for a while, I haven't been able to find a source that explains what it is/means. I'd appreciate if anybody could take a minute to explain this concept...

Homework Statement Given a rod of length 'l' placed upright on a smooth floor.A slight disturbance causes it to fall.Now required is the velocity with which the COM falls down when the rod makes angle θ with horizontal. The Attempt at a Solution now let the middle portion of the rod be...

Dear engineers and physicists, I would like to ask you a question about Component Mode Synthesis (CMS), which is the topic of my bachelor thesis. My primary resource is the classical AIAA article "Coupling of Substructures for Dynamic Analyses: an Overview" by Prof. Craig. For now I am...

I am trying to simulate and animate inverse dynamics. So I need to calculate torques. I started out by just taking a rod which rotates about its COM, applied a torque and then just used \tau=I\alpha to make sure I get back the same torque I applied. Next, I attached the rod to the ground with...

I know this question has been asked plenty of times, but nonetheless I wanted to get some recommendations that might better jive with my situation than other the other threads I've read about this topic. I'm a first year grad student in physics that hasn't had a course in fluid dynamics, but...

Hi guys, this is so confusing as there are lots of assumption needed (I think). I can't do this even though I got the answer and tried working backwards. A painter in a crate which hangs alongside a building, weighs 1000N.When the painter pulls on the rope, the force he exerts on the floor of...

Hi all, Sorry if I have posted in the wrong place. I am not to familiar with the forum titles and new setting. I have an argument and this is not homework. Suppose two particles P and Q of masses 2m and m respectivily are attached to the ends of a light inextensible string which passes...